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General (Details 4) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015
Treasury Shares [Abstract] |  |
Treasury Stock Acquired, Average Cost Per Share | $ 160.18 |
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased | 25,000,000 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 17,600,000 |
Number of Shares Repurchased | 1,400,000 |
Payments for Repurchase of Common Stock | $ 222 | $ 190

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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